SwiftDeploy: Building a Self-Writing Infrastructure Manager with Policy Enforcement — A Complete Technical Walkthrough

How I built a CLI tool that generates its own infrastructure configs, manages a full containerised stack, enforces deployment policies through OPA, exposes Prometheus metrics, and produces a live audit trail — all from a single YAML file. Table of Contents The Problem We're Solving Architecture Overview Stage 4A — The Engine The Manifest The Python HTTP Service The Dockerfile The Templates The CLI The Two Deployment Modes Stage 4B — The Eyes and Brain Prometheus Metrics OPA Policy Engine Gated L